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Securities - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2014 USD ($) Security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Number of securities | Security | 319 |  |  |
Aggregate fair value of securities | $ 167,100,000 |  |  |
Gain/Loss from net unrealized holdings, Net of tax | $ 1,300,000 | $ 24,424,000 | $ 16,693,000 | $ (3,802,000)
Unrealized gain or loss, Held to maturity |  | 0 |  |
Allowance for credit losses for available for sale debt securities |  | 0 |  |
Accrued interest receivable on available for sale debt securities |  | 8,100,000 |  |
Tax effect of the proceeds from sale of securities |  | 902,000 | $ (16,000) | $ (93,000)
Pledged of Fair Value of Securities as collateral |  | 115,600,000 |  |
Amortization cost of securities as Collateral not Separately Reported |  | 112,200,000 |  |
Debt Instrument Repurchase Agreement |  | 109,500,000 |  |
Securities Pledged for Federal Home Loan Bank At Fair Value |  | 505,900,000 |  |
Securities for Federal Home Loan Bank Not Separately Reported |  | 471,200,000 |  |
Debt Instrument Federal Home Loan Bank |  | 0 |  |
Securities Pledged For Derivative At Fair Value |  | 49,700,000 |  |
Securities Pledged For Derivative At Amortized Cost |  | 48,200,000 |  |
Debt Instrument Derivative Swap Agreement |  | $ 40,600,000 |  |

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